低温风洞中自发凝结氮液滴示踪特性分析  

Tracer Characteristic Analysis of Nitrogen Droplets Spontaneously Condensed in a Cryogenic Wind Tunnel

作　　者：侯佳鑫 高荣[2] 张伟[2] 谢军龙[1] 张晓青[1] 陈建业 HOU Jiaxin;GAO Rong;ZHANG Wei;XIE Junlong;ZHANG Xiaoqing;CHEN Jianye(School of Energy and Power Engineering,Huazhong University of Science and Technology,Wuhan 430074,China;China Aerodynamics Research and Development Center,Mianyang 621000,China)

机构地区：[1]华中科技大学能源与动力工程学院,武汉430074 [2]中国空气动力研究与发展中心,绵阳621000

出　　处：《工程热物理学报》2025年第1期51-56,共6页Journal of Engineering Thermophysics

基　　金：国家自然科学基金(No.52276009)。

摘　　要：为解决非接触式流场测量技术在跨声速低温风洞应用中缺乏合适示踪粒子的难题,对自发凝结氮液滴作为示踪粒子的可行性进行了分析。本文建立了Laval喷管中氮的非平衡凝结数值模型,分析了氮液滴的非平衡凝结过程。进一步,结合Stokes数、响应时间、液滴蒸发时间进行了液滴示踪特性分析。结果显示,自发凝结氮液滴数量与大小可控,且能表现出良好的示踪能力。本文为解决跨声速低温风洞中示踪粒子缺乏的问题提供了新的可行途径,并为氮液滴示踪能力优化奠定了理论基础。Application of non-intrusive measurement technique in transonic cryogenic wind tunnels is confined to the lack of suitable tracer particles.The present study explored the feasibility of utilizing spontaneous condensing nitrogen droplets as tracer particles.A numerical model of nitrogen non-equilibrium condensation was established.The non-equilibrium condensation process of nitrogen droplets was investigated.Further,droplet tracer characteristic was carried out by combining Stokes number,response time,and droplet evaporation rate.The results showed that spontaneous condensing nitrogen droplets can be controlled in quantities and size and can show good tracer ability.This paper offers a novel and viable approach to addressing the lack of tracer particles in cryogenic wind tunnels and establishes a theoretical framework for optimizing the tracer characteristic of liquid nitrogen droplets.

关 键 词：非平衡凝结 氮液滴 示踪粒子 Laval喷管 

分 类 号：O35[理学—流体力学]